Claire has 2 tanks. Tank Z and Tank A are of different capacities. If Tank Z is filled by a tap at a rate of 3 litres per minute and Tank A is filled by a tap at a rate of 7 litres per minute, when Tank Z is completely filled, 6 litres of water flowed out from Tank A. If Tank Z is filled by a tap at a rate of 5 litres per minute and Tank A is filled by a tap at a rate of 5 litres per minute, when Tank Z is completely filled, Tank A is only half-filled. What is the capacity of Tank A? Express your answer in litres.
|
Scenario 1 |
Scenario 2 |
Tank type |
Tank Z |
Tank A |
Tank Z |
Tank A |
Volume of the tank |
3 u |
7 u - 6 |
5 p |
5 p x 2 = 10 p |
Let 1 u be the time taken for Scenario 1.
Let 1 p be the time taken for Scenario 2.
3 u = 5 p --- (1)
7 u - 6 = 10 p
7 u = 10 p + 6 --- (2)
Make u the same.
(1) x 7
21 u = 35 p --- (3)
(2) x 3
21 u = 30 p + 18 --- (4)
(3) = (4)
35 p = 30 p + 18
35 p - 30 p = 18
5 p = 18
1 p = 18 ÷ 5 = 3.6
Volume of Tank A
= 10 p
= 10 x 3.6
= 36 ℓ
Answer(s): 36 ℓ